Fix subscription test

app/src/androidTestGoogleplay/java/org/tasks/caldav/CaldavSubscriptionTest.kt

@@ -7,15 +7,21 @@ import kotlinx.coroutines.runBlocking
 import org.junit.Assert.assertEquals
 import org.junit.Test
 import org.tasks.R
+import org.tasks.billing.Inventory
 import org.tasks.data.CaldavAccount
 import org.tasks.injection.ProductionModule
+import javax.inject.Inject
 
 @UninstallModules(ProductionModule::class)
 @HiltAndroidTest
 class CaldavSubscriptionTest : CaldavTest() {
+    @Inject lateinit var inventory: Inventory
+
     @Test
     fun cantSyncWithoutPro() = runBlocking {
         preferences.setBoolean(R.string.p_debug_pro, false)
+        inventory.clear()
+
         account = CaldavAccount().apply {
             uuid = UUIDHelper.newUUID()
             id = caldavDao.insert(this)

app/src/main/java/org/tasks/billing/Inventory.kt

@@ -34,7 +34,8 @@ class Inventory @Inject constructor(
     fun clear() {
         Timber.d("clear()")
         purchases.clear()
-        subscription.value = null
+        subscription.postValue(null)
+        hasPro = false
     }
 
     fun add(items: Iterable<Purchase>) {